Nothing bad about fruit (5)
I believe the answer is:
olive
'fruit' is the definition.
(I've seen this before)
'nothing bad about' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'bad' becomes 'evil' ('evil' is associated in meaning with 'bad').
'about' is a reversal indicator.
'evil' backwards is 'live'.
'o'+'live'='OLIVE'
(Other definitions for olive that I've seen before include "Greyish-green colour" , "Yellowish-green - fruit" , "One [TYPE OF TREE] is from the Mediterranean" , "Girl's name; tree" , "yellowish green" .)